This has always been my concern for PSG they don't seem to look like such a team thst is willing to be patient enough to want to build a team for the scratch and probably get to the point they become so formidable they will be able to be very productive even outside the Ligue 1 but they rather choose to keep focusing on starts with the mind that that's the way to helping them been able to achieve the kind of results they want to get.
If they are willing to build a team using young stars and talents such as the likes of coman and nkunku who were all gotten from their academy, they will be able to get a team thst will give them the kind of results they Desire even if it's going to take sometimes, but in the end it will be worth the wait and it will be even cost effective for them, just like Leverkusen now who's doing so well already and they are getting these results with their own players they did nurtured and not buying stars alone, it's even much better a team is able to build a star and get him to give the team the kind of performance they desire to get and later sell him off at a huge price which will now be another source of income to the team.
The Ligue 1 has always been the only place where PSGs dominance has been felt the most, they can possibly become a better team outside this small league where it seems their prowess is the most if only they are willing to probably risk a whole season to fixing the team and getting the team to produce the desired results and subsequent they would have a reliable team they can actually depend on the getting the kind of results they wanted all along.
The shortcuts made by PSG certainly make them a strong team in a very short time, and certainly it is not difficult for them to continue to be able to get many star players with the power of money they currently have, but of course PSG must be prepared for risks that are also detrimental to their finances if if the star players they buy now are not able to meet the expectations charged in achieving the championship target, For now, what PSG is doing I don't think is entirely wrong, because will be difficult for a team to develop only by relying on the talents of academy players, yes maybe at least PSG must also be brave to orbit their young players into the current main squad in order to at least reduce their expenses.
A club that has large finances and continues to spend a lot of money to bring in star players with great skills will ultimately experience losses because if the goal is to win big titles such as the Champions League, it should not need to be too ambitious and continuously pressure players to continue to stay at PSG. and putting pressure on winning the champions league title, while the burden you say will ultimately reduce the quality of the players' performance and their enthusiasm will decrease.
Like the case of Kylian Mbappe last season, in the end it seemed as if Mbappe performed really well, but we don't know whether he had given all his skills and caused a big loss to PSG when he had to leave for free when his contract had finished.
There are still several other risks such as losses that do not get anything from the initial goal, in the end the money that has been spent does not get any return and maybe I have to agree with you that developing the talent of young players from academics would be better or for example bringing in 1 star players and several players others from young academic players.
In this way PSG will not lose too much.